[release-branch.go1.9] doc/go1.9: fix typo in Moved GOROOT
[release-branch.go1.9] doc/go1.9: fix typo in Moved GOROOT

Change-Id: I71bfff6a3462e6dfd7a65ef76ec56644bae37c34
Reviewed-on: https://go-review.googlesource.com/57272
Reviewed-by: Avelino <8efd86fb78a56a5145ed7739dcb00c78581c5375@avelino.xxx>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Reviewed-on: https://go-review.googlesource.com/58650
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/go,nawawi/go,golang/go,nawawi/go,golang/go,nawawi/go,nawawi/go,nawawi/go,golang/go,golang/go,nawawi/go,nawawi/go,nawawi/go,golang/go,golang/go,golang/go